The best way to understand a program is to try to change it.
理解程序的最好方法是尝试改变它。
The only way to deal with the past is to accept it.
你乐于挥霍的时间，不算浪费。
I'm interested in the weak materials, the materials that people don't think can be used for permanent structures.
The only limit to our realization of tomorrow is our doubts of today.
You are always a valuable, worthwhile human being — not because anybody says so, not because you're successful, not because you make a lot of money — but because you decide to believe it and for no other reason.